linux-kernel - [PATCH v3 15/16] mm/huge_memory: comment the subtly logic in __split_huge

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Date:   Mon, 4 Jul 2022 21:22:00 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <shy828301@...il.com>, <willy@...radead.org>, <zokeefe@...gle.com>,
        <songmuchun@...edance.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v3 15/16] mm/huge_memory: comment the subtly logic in __split_huge_pmd

It's dangerous and wrong to call page_folio(pmd_page(*pmd)) when pmd isn't
present. But the caller guarantees pmd is present when folio is set. So we
should be safe here. Add comment to make it clear.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/huge_memory.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 36f3fc2e7306..8380912b39fd 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2336,6 +2336,10 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 
 	if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd) ||
 	    is_pmd_migration_entry(*pmd)) {
+		/*
+		 * It's safe to call pmd_page when folio is set because it's
+		 * guaranteed that pmd is present.
+		 */
 		if (folio && folio != page_folio(pmd_page(*pmd)))
 			goto out;
 		__split_huge_pmd_locked(vma, pmd, range.start, freeze);
-- 
2.23.0